This was first published in 1947 and its fourth edition after a number of amendments was published in 1970. After those tests of special aptitude were constructed in almost all domains of Education and training” (Rao, 1990, p259). Aptitude is a trait that varies from individual to individual. That is why speed and accuracy is quite different from one another when they are involved in problem solving. No agreed definition of Aptitude has been advanced by psychologist. It is essentially a natural ability or skill especially in learning. Direct and exact measurement of aptitude is much difficult. Moreover, aptitude and intelligence is not one and the same thing. It is also different from achievement and interest. It is specific and restricted to some extent. According to Woodworth and Marquis (1963),”Aptitude is a predicted achievement.” While Aiken (1985: p.224) defined it, “Aptitude has traditionally referred to a person’s capacity to profit from further training.” Aptitude is an abstract quality or psychological characteristics which cannotmeasure directly. A device used for the purpose of measurement of this potentiality is termed as aptitude test.